Fuse.



UNITED STATE FUSE.

Application led June '2, l'.

To all Hf/,o'f/z. it may conc-em:

Be itknown' that I, illuminati C. Bennie, a. citizen of the United States, residing in the borough of the Bronx, citt)v and State of bien? York, have invented certain new and useful Improvements in Fuses, of which the fol lowing is a specification.

This invention relates to fuses for use in protecting electric circuits from the dow of excessive current.

More particularly, the invention relates to electric fuses of the type comprising the combination ofa fusible metallic strip, a tube of insulating material inclosing the same and means for securing the ends of the fusible strip rigidly to the ends of the inclosing tube.

In fuses of this type as heretofore constructed it has been proposed to employ, gripping members at each end of the tube lying on opposite sides of the fusible strip, so arranged that they may be moved length Wise of the fuse and when so moved will be caused to grip the ends` of the fusible strip by a wedge action. This invention relates to fuses of this character and involves the provision of means Whereb)Y one or more of the gripping members will be held against rotational movement While it is being moved lengthwise of the fuse to cause it to grip the strip. if no means Were provided forguarding against such rotational movement of the gripping members, such rotation might take place and might lead to distortion or breakage of the fusible strip and thus cause the fuse tooperate improperly or not at all. For the purpose of preventing such rotational movement of the gripping members,

I provide projections upon one or more of the gripping members adapted to be received in recesses formed in the inclosing tube ot the-fuse, and serving to hold the gripping member from turning about the axis of the tube as the member 'is moved in the direction of the length of the fuse. A further feature of the invention involves the provision otmeans for locating one or more of the' gripping members with reference to the fusible strip. ln accordance with this feature of the invention the strip proper is secured at its ends to terminal members and one or more of the gripping members are provided with projections adapted to enter recesses in the adjacent Speeication of Letters Patent,

terminal memb uw o,... t". sion the parts or the tuscmajy l more' rapidly than has been the ease be f fore Without danger o the central portion of the fusible strip being displaced from the center of the length of the ibase.

he preferred embodiment .Y tion is illustrated in the accompanying drawings in which- Figure l is a central secticn o? a 2 is a central section .right a section ot Fig. l with cer detached, Fig. 3 is an elevation of the fuse with the cap detached t tube and Fig. e is a transverse scctien line Ll-i of 1F ig.. 3.

Referring to these drawings,a fitsibic s a is shown at 5, this passing` lengthaiss through an inclosing tube t5 insulatinw material. The ends off strip 5 may cured directly to the ends et the inclof tube, if desired, but prefer to secure ends of the strip 5 to terminal members thicker and stronger metal and to s these terminal members to the ends or ...n inciosing tube. The terminal members shown at 'i and they are prcfe'ably shoe. bars et copper. The 6,. fue strip .3 are secured to these 'terminals isuitable nuts and bolts For the purpose of securing each terminal member i to the adjacent ena of he tube o, tire. gripping members 9 are provided at each end ot tube t3, the tuin members 9 of each pair lying on opposite siees of terminal member l" that end of the fuse. e

Q tapered or wedge-shaped upon their curved surfaces. The tapered formation of these gripping members is shown in 2.

Each end of the tube G is lthreaded is adapted to receive an interior-l5v threaded cap l0. This cap is placed upon the end of the tube 6 and screwed up thereon so wat the inwardly turned flange ll at the of 3. the cap engages the gripping members 9 and as the cap is screwed up further, it will move the gripping members 9 in thedirection the .length or fuse. 51s gripping members 9 are so moved. they vwill be caused te more toward each other by the coaction of their Wedge-shaped or tapered surfaces with the interior trail ol tbe tube 6 at enel of the tube, anti these gripping members will therefore grip the terminals l' between them to hold those terminals and the strip 5 .rigidly with respect 'to the tube lt will be observecl that if the pairs oi" gripping members 9 were allowed to turn more or less about the axis ot' tube f3 with the coacting cap l0 as the latter is turned, the two terminals 'Z would be turned in 0pposi directions with the result 'the-.t the strip 5 would be twisted. fhis might result in breaking the strip 5 in which event the fuse would not be usable, but even if the striL 5 were not broken such twisting would be vvery objectionable. It might ma terially alter the volume of current which would cause blowing of the fuse. ln order to prevent such twistuigr movement of the '-e, Tl provide means for holding the gripmembers 9 against rotationel movement with respect tothe tube 6, particularly rotational movement with the adjacent cap 10. F or this purpose .l provideone gripping member 9 of each pair with 2 projection l2 which projection is adapted to enter a recess in the tube 6, such, for in stance, as the recess shown' in Fig. 3, cut in the end of the tube. Projections l@ with their corresponding recesses may be provided on each gripping member 9, but l tint?. it suiiicient to provide one on one i member of each pair. llt will be when the gripping members es as shown in Fig. 2, with the proie in the recesses provided therefor, `er ing,r up of the cap l0 upon the end of tub G will not cause turningw movers. 'it of the members 9'; as the cap is orci'wv hers 9 to their gripi .w @lange ll of the cap will ipe i face oi7 members 9 Without turning' those member As shown in Fig. 2, oneo the proiection i2 consiste in which passes throug one oi the grippi' eers Sl and project on the straight s- -e creoll well as on the semicircuiar Sicile. The end 13 oi this pin projecting from the side is adapted to be receivecl in en opening proo ricletl therefor in the coucting terminal 7. W hen assembling the parts, the strip 5 with its terminals is positioned Within tube 6 anti the gripping member 9 provided with the projection 13 is then positioned with the projection i3 in the opening in terminal 7 and the projection 1'2 in the recess in tube 6. The coacting terminal 7 may then be positioned and the cap l0 applied at this encl of the fuse. This procedure insures "ener positioning of the strip 5 with rei to the length of the/fuso; in other the use. of the projection i3 coacting with e. properly positioned. recess in the ter'u -el 7 insures the center of strip 5 @S3 mil the center of tube 6.

airing described mi; intenties, l' claim as nenv therein enti desire to secure by Letters Patent of the United. States is:

l. rEhe combination of a fuse, s tube of insulating materiel inclosing the saine, a parir of gripping members lying on opposite sides of the fuse at each end of the tube, and projecting beyond the. end of the same and having inclined outer surfaces whose greatest diameter exceeds the interior diameter of the tube, a cap mounted upon each enti o' the 'tube and so formed as to contact the outer ends or" said. gripping members at that sides of the fuse at euch enfi t` and haring inclinecl outer tv greatest diameter exceeds the inf' ern/eter of tl e tube, e csp thr .i end. or the tube and upon the tube ping members tion. of the length of the fue preventing turning?, oi.z the "i err relatively to the tube,

insulating' muterial'inciosi tue pair of gripping members lying on opposite or' the fuse at each end o tube and. having' inclined outer surfaces whose greatest diameter exceeds the interior diam eter of the tube, a cap threaded upc each end ofthe tube and adapted when turned upon the tube to engame the adjacent gripping members and move them` in the direction of the length of the fuse and a stud on one ot' the gripping memberscntering a notch in the end o'f the tube, substantially as set forth.

4. The combination of a fuse`r a tube of insulating material inclosing the same, :i pair of gripping members lying on opposite sides o the fuse-at each end of the tube, a cap threaded upon each end ot the tube and adapted when turned upon the tube to move the adjacent gripping members toward each other in gripping relation to the fuse and means adapted to lock together a gripping member and the fuse against relative movement in the direction of the length of the fuse, and thus insuring the positioning ofi e gripping-member upon the ,fuse at a desired point in the length of the fuse, substantially as set forth.

5. The combination of a fuse, a tube of insulating material inclosing the same, a pair of gripping members lying on opposite sides of the fuse at each end of the'tube and havinginclined outer surfaces Whose greatest diameter exceeds the interior diameter of the tube, a stud on one of the gripping members entering and closely fittingv within an opening in the fuse and a cap threaded upon each end of the tube and adapted when turned upon the tube to engage said members and move them in the direction of the 1i length of the fuse, substantially as set forth.

This specification signed and witnessed this 3 day of June, 1913.

WILLIAM c. BANKS.

Witnesses: v

AUGUSTE SEvEs'mE, THos. J. BYRNs. 

